Double-Y-branch optical waveguide phase modulator
A phase modulator, optical waveguide technology, applied in optical guides, instruments, optics, etc., can solve problems such as noise
Inactive Publication Date: 2021-04-20
THE 44TH INST OF CHINA ELECTRONICS TECH GROUP CORP +1
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Problems solved by technology
[0004] The technical problem to be solved by the present invention is to provide a double Y branch optical waveguide phase modulator to solve the noise problem introduced by radiation mode coupling in the existing double Y branch optical waveguide modulator
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[0014] The present invention will be further described below in conjunction with accompanying drawing.
[0015] In the description of the present invention, unless otherwise specified and limited, it should be noted that the term "connection" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, or it can be the internal communication of two elements, it can be Directly connected or indirectly connected through an intermediary, those skilled in the art can understand the specific meanings of the above terms according to specific situations.
[0016] Such as figure 2 Shown is a structural diagram of a preferred embodiment of a dual Y-branch optical waveguide phase modulator of the present invention. A dual Y-branch optical waveguide phase modulator according to the present invention includes a light source 1, a phase modulator chip 2 and an optical fiber ring 3 connected in sequence, and the phase modulator chip 2 i...
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The invention discloses a double-Y-branch optical waveguide phase modulator, which comprises a light source, a phase modulator chip and an optical fiber ring which are connected in sequence, wherein the phase modulator chip is further connected with a photoelectric detector and a signal processing circuit in sequence, the phase modulator chip comprises a substrate, a first Y-branch optical waveguide, a second Y-branch optical waveguide and a base waveguide, the first Y-branch optical waveguide, the second Y-branch optical waveguide and the base waveguide are manufactured on the substrate, the output end of the first Y-branch optical waveguide is connected with one end of the base waveguide, the other end of the base waveguide is connected with the input end of the second Y-branch optical waveguide, and the output end of the first Y-branch optical waveguide deviates from the input end of the second Y-branch optical waveguide in the direction perpendicular to optical signal propagation by a distance d ranging from 100-4000 [mu]m, so that a radiation mode generated at the beam combining point of the first Y-branch optical waveguide is radiated out from the end face of the phase modulator chip so as to eliminate crosstalk and noise problems caused by coupling of the radiation mode in an optical path.
Description
technical field [0001] The invention relates to the technical field of phase modulators, in particular to a double Y branch optical waveguide phase modulator. Background technique [0002] The fiber optic gyroscope is an angular rate sensing instrument based on the Sagnac phase shift effect. It has a series of advantages such as all solid-state structure, small size, anti-electromagnetic interference, high precision and long life. figure 1 It is the schematic diagram of the existing fiber optic gyroscope. The fiber optic gyroscope is composed of a light source, a coupler, a Y waveguide, a polarization-maintaining fiber ring, a photodetector and a signal processing circuit. The optical path and the circuit part adopt an all-digital closed-loop detection scheme. When the polarization-maintaining fiber ring rotates at an angular rate Ω relative to the inertial space, the two columns of light waves transmitted along the positive and negative directions of the polarization-maint...
Claims
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IPC IPC(8): G02B6/125G02B6/126G01C19/72
Inventor 田自君杨千泽闫应星徐鎏婧
Owner THE 44TH INST OF CHINA ELECTRONICS TECH GROUP CORP